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This article is about how to use the reduce method and the pop method in javascript arrays. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

First, reduce method 1 directly vs open

2 Code part var geyao= [1Jing 3jue 5] let sum = arr.reduce (function (prev, cur, index, arr) {console.log (prev, cur, index); return prev + cur;}) console.log (sum); 3 run result

Summary:

For the function to be executed, you can also pass parameters to the function to be executed, which are:

Prev: the return value of the last call to the function

Cur: current element

Index: current element index

Arr: the array that is traversed

Initial value of function iteration

2. Pop1 opens the vs directly

2 the code part / / push () adds an element at the end of the array and receives one or more parameters / / unshift () to add the element at the first bit of the array Receive one or more parameters / / pop () delete the element at the end of the array / / shift () delete the first element of the array const geyao = ['ballad'] geyao.push ('excellent') geyao.push ('powerful') console.log (geyao, 'geyao') geyao.unshift (' I am') console.log (geyao, 'geyao') geyao.pop () console.log (geyao 'geyao') geyao.shift () console.log (geyao,' geyao') 3 run result

Summary:

/ / push () add elements at the end of the array, receive one or more parameters / / unshift () add elements in the first bit of the array, receive one or more parameters / / pop () delete the last element of the array / / shift () delete the first element of the array thank you for reading! This is the end of the article on "how to use the reduce method and pop method in the javascript array". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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